Question

522. Вычислите
1) -3,8 +1,5-4
-------------------
7-4,9​
решите все 4 уравнения

Answer 1

Ответ:

$1) \frac{ - 3.8 + 1.5 - 4}{7 - 4.9} = \frac{ - 6.3}{2.1} = \frac{ - \frac{63}{10} }{ \frac{21}{10} } = \frac{ - 63}{21} = - 3$

$2) \frac{6.8 - 7 + 8}{5.4 - 6.7} = \frac{7.8}{ - 1.3} = - \frac{ \frac{39}{5} }{ \frac{13}{10} } = - 6$

$3) \frac{ - 0.5 \times 8 + 1.6 \times 3}{0.84 - 1} = \frac{ - 4 + 4.8}{ - 0.16} = \frac{0.8}{ - \frac{4}{25} } = - \frac{ \frac{4}{5} }{ \frac{4}{25} } = - 5$

$4) \frac{0.6 \times ( - 9) - 3.6}{ - 1.5 \times 4} = \frac{ - 5.4 - 3.6}{ - 6} = \frac{ - 9}{ - 6} = \frac{3}{2}$